Shadow Warrior is one of the classic Build engine game with fun and satisfying gunplay and some poor design choices.
If you like the idea of a combat racer that lets you move at blistering speeds and drive on walls and ceilings, then Rollcage may be just the game for you.
Hard Reset is a fun action-packed shooter that could benefit from more content.
The precursor to the popular POSTAL 2, POSTAL is where it all started. The Redux version doesn’t breathe new life into the game but it’s definitely worth checking out if you enjoyed the original.